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    <title>Extensions - Metro 4 :: Popular HTML, CSS and JS library</title>
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                <h5>Table of contents</h5>
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                    <li class="toc-entry"><a href="#">Extensions</a></li>
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                <h1>Extensions</h1>
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                    Metro 4 objects and types extensions.
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                <h3>About</h3>
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                    Metro 4 contains the number of extensions for standard javascript types and objects.
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                    <thead>
                    <tr>
                        <th>Object</th>
                        <th>Extension</th>
                        <th>Desc</th>
                    </tr>
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                    <tr>
                        <td><code>Array</code></td>
                        <td><code>shuffle()</code></td>
                        <td>Shuffle array elements</td>
                    </tr>
                    <tr>
                        <td><code>Array</code></td>
                        <td><code>clone()</code></td>
                        <td>Clone array</td>
                    </tr>
                    <tr>
                        <td><code>Array</code></td>
                        <td><code>unique()</code></td>
                        <td>Get array unique element</td>
                    </tr>
                    <tr>
                        <td><code>Number</code></td>
                        <td><code>format(n, x, s, c)</code></td>
                        <td>Format number value. n: length of decimal, x: length of whole part, s: sections delimiter, c: decimal delimiter</td>
                    </tr>
                    <tr>
                        <td><code>String</code></td>
                        <td><code>capitalize(str)</code></td>
                        <td>Capitalize string</td>
                    </tr>
                    <tr>
                        <td><code>String</code></td>
                        <td><code>contains(substr, index)</code></td>
                        <td>Check if string contains substring</td>
                    </tr>
                    <tr>
                        <td><code>String</code></td>
                        <td><code>toDate(mask[, locale])</code></td>
                        <td>
                            Convert string to date by mask. You can use next identifiers:
                            <code>dd</code>, <code>%d</code> - for day,
                            <code>mm</code>, <code>%m</code> - for month,
                            <code>yy</code>, <code>yyyy</code>, <code>%y</code>, <code>%Y</code> - for year,
                            <code>hh</code>, <code>%h</code> - for hours,
                            <code>ii</code>, <code>%i</code> - for minutes,
                            <code>ss</code>, <code>%s</code> - for seconds.
                            Example:
                            <code>"1972-12-21 04:30:00".toDate("yyyy-mm-dd hh:ii:ss");</code>
                            <code>"21-12-1972".toDate("dd-mm-yyyy");</code>
                            <code>"21 грудня 1972".toDate("dd mm yyyy", "uk-UA");</code>
                        </td>
                    </tr>
                    <tr>
                        <td><code>Date</code></td>
                        <td><code>format(format, locale)</code></td>
                        <td>Format Date object (see <a href="dateformat.html">this article</a>)</td>
                    </tr>
                    <tr>
                        <td><code>Date</code></td>
                        <td><code>addHours(hours)</code></td>
                        <td>Add hours to date</td>
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